Improvement in sheet-metal-bending machines



w. F. K'ISTLER.

Sh'et-Metal Bending-Machines.

Patented September 16, 1873.

Inventor.

. Witnesses flilarneys.

"' ivrrnn STATES PATENT QFFICE.

I WILLOUGHBY F. KISTLEB, CINCINNATI, OHIO, ASSIGNOR TO THOMAS 85ROBINSON, OF SAME PLACE.

IMPROVEMENT IN SHEET-METAL-BENDING MACHINES.

Specification forming part of Letters Patent No. 142,921, datedSeptember 16, 1873 application filed May 21, 1873.

.To all whom it may concern:

Be it known that I, WILLOUGHBY F. KIST- LER,0fClIlCl11I12ttl,in thecounty of Hamilton and in the State of Ohio, have invented certain newand useful Improvements in Machine for Folding Sheet Metal; and dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawingsand to the letters of reference marked thereon, making a part of thisspecification.

My invention relates to machines for bendin g sheet metal in which aretwo hinged bending-bars operating in connection with a stationary bed;and the nature of my invention consists in the construction andarrangement of the several parts, as more fully hereinafter set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to de scribe itsconstruction and operation, referrin g to the annexed drawing, in whichFigure l is a plan view of a machine for bending sheet metal embodyingmy invention'. Fig. 2 is a transverse vertical section, and Fig. 3 anend elevation, of the same. Fig. 4 shows, in perspective, the devicesfor releasing one end of the upper bending-bar.

A represents the stationary bed, supported on a suitable frame, E. B isthe upper bending-bar, around which the sheet metal is to be bent, and Gis the bar by which the metal is bent around the bar B. D D representtwo levers, which are hinged or pivoted to adjustable boxes or slides GG, one at eachend of the machine. One end of the upper bendingbar B isfirmly attached to the lever D, while the other end is loose or detachedfrom the lever D. Upon this end of the bendingbar B is a lug orprojection, a, and a corresponding recess, a, is made in the lever D forthe lug a to enter, the lever D being then held by a button, I), asshown. At each end of the bed A is pivoted a cam, J, to operate upon afriction-roller, (Z, on theside of the lever D or D. The cams J J may beeither rigidly or loosely attached to the ends of a shaft passingthrough the machine; or they may have separate and independent journalsupon which to turn, as may be most advantageous in manufacturing. Eachcam J has on its inner side a groove, forming an upper cam-surface from6 to f, and a lower cam-surface from h to i, and each cam is providedwith a handle, I, by means of which it is turned.

The metal to be bent is passed in between the bending-bar B and bed A tothe point where the fold is desired. The cams J J are then, by means oftheir handles I I, brought forward over the rollers 61 d, thecam-surface from f to e pressing down upon the same, givin g an equaland even pressure and holding the sheet metal. By now raising the folderor bending-bar O, the metal is bent over the bar B. When the metal isbent the folder is let down, and the cams J J turned backward until thepoints 17 of their lower cam-surfaces, operating on the under sides ofthe rollers 01 d, have raised the bending-bar B sufficiently to releasethe metal and move it to the next point where it is to be bent. If themetal, by similar successive operations, is bent around the bar B in theform of a box, the metal could not be removed until one of the levers Dor D were detachable from the bending-bar. By turning the button b thelever D may be raised independent of the bar B, and the metal drawn out.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The bending-bar B, attached at one end to the lever D, and providedat the other end with a lug, a, and button I), in combination with thelever D, as and for the purposes herein set forth.

2. The combination, with the frame E, of the bed A, cams J J,bending-bar B, with projection a, bar 0, hinged or pivoted lever D, withfriction-roller d and recess a, lever D, and the adjustable boxes G G,all constructed substantially as and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 18th day of April, 1873. W. F. KISTLER. [L. s.] Witnesses:

A. W. FRANCIS, XVILLIAM WINTERS.

